The coffee and doughnut chain currently operates nearly 7,000 stores nationwide. Each new store adds an average of 20 to 25 new employees, both full and part-time a Dunkin spokeswoman said.

Dunkin' Donuts controls roughly 23% of the coffee and snack-shop market, according to Los Angeles-based industry research firm IBISWorld.

Its biggest competitor, Starbucks (SBUX, Fortune 500) controls about 32.6% market share and operates about 11,000 stores in the U.S.

The announcement came as Dunkin' also said it has finished streamlining its supply chain, consolidating four existing regional suppliers under one entity, National DCP. The company said the move will cut costs.